a(n) = A247503(A277324(n)).

Terms

a(0) =2a(1) =2a(2) =2a(3) =10a(4) =10a(5) =10a(6) =50a(7) =10a(8) =10a(9) =250a(10) =250a(11) =50a(12) =250a(13) =250a(14) =50a(15) =110a(16) =110a(17) =250a(18) =6250a(19) =1250a(20) =1250a(21) =31250a(22) =6250a(23) =550a(24) =2750a(25) =6250a(26) =6250a(27) =13750a(28) =2750a(29) =2750